The acoustical advantages of these are due to the acoustical materials in the wicker basket. The "plant" is camouflage.
Given the previous comments I thought I'd try to craft an answer that stated the obvious reason why they work, but also appealed to those who feel plants can be diffusers.
I personally use the traditional Real Traps panels and Eighth Nerve products. I've tried plants but they did nothing for the sound that I could discern. My cat enjoyed tearing into them though.